/*
 * Copyright 2018-Present Okta, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.okta.spring.boot.oauth.http;

import com.okta.commons.lang.ApplicationInfo;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpRequest;
import org.springframework.http.client.ClientHttpRequestExecution;
import org.springframework.http.client.ClientHttpRequestInterceptor;
import org.springframework.http.client.ClientHttpResponse;

import java.io.IOException;
import java.util.stream.Collectors;

public final class UserAgentRequestInterceptor implements ClientHttpRequestInterceptor {

    private final static String USER_AGENT_VALUE = ApplicationInfo.get().entrySet().stream()
            .map(e -> e.getKey() + "/" + e.getValue())
            .collect(Collectors.joining(" "));

    @Override
    public ClientHttpResponse intercept(HttpRequest request, byte[] body, ClientHttpRequestExecution execution) throws IOException {
        request.getHeaders().add(HttpHeaders.USER_AGENT, USER_AGENT_VALUE);
        return execution.execute(request, body);
    }
}